[Samba] [smbclient] Fails sending pop-up message with -M

[Rowland Penny]

On Wed, 2021-09-29 at 09:02 -0700, Jeremy Allison via samba wrote:
> On Wed, Sep 29, 2021 at 05:52:17PM +0200, Gilles via samba wrote:
> > On 29/09/2021 17:40, Jeremy Allison wrote:
> > > On Wed, Sep 29, 2021 at 05:03:54PM +0200, Gilles via samba wrote:
> > > > Hello,
> > > > 
> > > > From Debian 9 running Samba 4-5-16, I'd like to send a pop-up 
> > > > message to a Windows (7) host, but none of the following works:
> > > > 
> > > > smbclient -M \\WIN-PC "test"
> > > > smbclient -M //WIN-PC "test"
> > > > smbclient -M ////WIN-PC "test"
> > > > smbclient -M '\\WIN-PC' "test"
> > > > 
> > > > Would someone have a working example?
> > > > 
> > > > FWIW, the Windows host is running a Comodo firewall. Would I
> > > > need 
> > > > to allow connection to a given TCP/UDP port?
> > > 
> > > -M messaging is an SMB1-only thing I believe. Is the Windows7
> > > box 
> > > running an SMB1 server ?
> > 
> > I don't know what an SMB1 server is. Is it a service I need to run
> > on 
> > the Windows host?
> 
> Yes, but you really shouldn't :-).
> 
> https://techcommunity.microsoft.com/t5/storage-at-microsoft/stop-using-smb1/ba-p/425858
> 

Win 7 does use SMBv1, as will Samba 4.5.16 on Debian 9, so if it did
work on those EOL things, it still should. Easiest way to find out if
it is the firewall, temporarily turn it of and see if it works.

Rowland